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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 15: Safeguards Analysis and Verification

AGA 15.3: Vortrag

Freitag, 20. März 2015, 11:30–12:00, EMH 225

Buildup of radioxenon isotopes in MOX-assemblies — •Thomas Gniffke and Gerald Kirchner — Carl Friedrich von Weizsäcker-Centre for Science and Peace Research, Beim Schlump 83, 20144 Hamburg, Germany, Tel +49 40 42838 7229, Fax +49 42838 3052, http://www.znf.uni-hamburg.de

Radioxenon is the main tracer for detection of nuclear tests conducted under- ground under the verification regime of the Comprehensive Nuclear Test Ban Treaty (CTBT). Since radioxenon is emitted by civilian sources too, like com- mercial nuclear reactors, source discrimination is still an important issue. Inventory calculations are necessary to predict which xenon isotopic ratios are built up in a reactor and how they differ from those generated by a nuclear explosion. The screening line actually used by the CTBT Organization for source discrimi- nation is based on calculations for uranium fuel of various enrichments used in pressurized water reactors (PWRs). The usage of different fuel, especially mixed U/Pu oxide (MOX) assemblies with reprocessed plutonium, may alter the radio- xenon signature of civilian reactors. In this talk, calculations of the radioxenon buildup in a MOX-assembly used in a commercial PWR are presented. Implications for the CTBT verification regimes are discussed and open questions are addressed.